US4376368A
Expired / Lapsed
US
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Method to measure yarn tension
Assignee: Milliken Research Corp
•
Filing: 1981-02-23
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Granted: 1983-03-15
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Expires: 2001-02-23
Abstract
Abstract Method to detect the tension and/or variation in the tension of a running length of yarn by measuring the frequency of vibration of the yarn. The yarn is initially vibrated by impingement thereon by a jet of air under pressure.
Inventors
- 👤 David B. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:32
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/04; G01L5/10; B; B65; B65H; B65H59/00; B65H59/40; G01H; G01H13/00; B65H2511/00; B65H2511/50; B65H2511/52; B65H2557/00; B65H2557/60; B65H2557/61; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
A method of manufacturing a textured yarn comprising the steps of: supplying a running length of continuous filament yarn, heating the yarn, false twisting the yarn after heating, heating the yarn after false twisting the yarn, causing the yarn to vibrate at its harmonic frequency, measuring the harmonic frequency of the yarn being vibrated to determine the tension thereon and taking up the false twisted yarn.
Claim 2
Independent Claim
66 words
A method of manufacturing a textured yarn comprising the steps of: supplying a running length of continuous filament yarn, heating the yarn, false twisting the yarn after heating, heating the yarn after false twisting the yarn, causing the yarn to vibrate at its harmonic frequency, measuring the harmonic frequency of the yarn being vibrated to determine the tension thereon and taking up the false twisted yarn.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the yarn is vibrated and the frequency measured prior to the false twisting thereof.
Claim 4
Independent Claim
45 words
The method of measuring the tension of a running length of yarn comprising the steps of: supplying a running length, causing the yarn to vibrate at its harmonic frequency and measuring the harmonic frequency of the yarn as it vibrates to determine the tension thereof.
Claim 5
Independent Claim
45 words
The method of measuring the tension of a running length of yarn comprising the steps of: supplying a running length, causing the yarn to vibrate at its harmonic frequency and measuring the harmonic frequency of the yarn as it vibrates to determine the tension thereof.
Claim 6
Dependent Claim
21 words
The method of claim 3 wherein the vibration of the yarn is caused by the impingement of air under pressure thereagainst.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |